/Engine/Source/Runtime/Engine/Classes/Engine/MemberReference.h
Set to a non-'self' member, so must include reference to class owning the member.
void SetExternalMember ( [FName](API\Runtime\Core\UObject\FName) InMemberName, [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< class [UObject](API\Runtime\CoreUObject\UObject\UObject) > InMemberParentClass )